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Homework Help: Percentage of upolarized light

  1. Dec 16, 2008 #1
    1. The problem statement, all variables and given/known data
    Unpolarized light is passed through a polarizer-analyzer combination. The transmission of the polarizer and the analyzer are at 30 degrees to each other. What percentage of the unpolarized light gets through the combination?

    2. Relevant equations

    3. The attempt at a solution
    I am at a loss at to what to do. The only two equation I can think of, or find, that related to polarized light are the intensity equations: I = 1/2Io and I = Iocos^2(theta).

    The answer according to my review packet is 37.5 degrees... I just don't know how to begin in order to get that answer. Will someone give me a few hints? Please?
  2. jcsd
  3. Dec 16, 2008 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Let's start with the 1st polarizer. If Io is the initial intensity, what is the intensity after the 1st polarizer?
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